Syntheses of β-lactams from acetic acids and imines induced by phenyl dichlorophosphate reagent
作者:Ana Arrieta、Fernando P. Cossio、Claudio Palomo
DOI:10.1016/s0040-4020(01)96484-1
日期:——
Among the reagents known to produce β-lactams from imines and acetic acids, only phenyl dichlorophosphate and 1-methyl-2-chloropyridinium iodide are suitable for the synthesis of vinylamino- β-lactams. Reaction of acetic acids with ethanolimine derivatives promoted by phenyl dichlorophosphate affords oxazolidines instead β-lactams. Protection of the hydroxyl group as the trimethylsilyl ether in the
Triphenylphosphine dibromide and dimethylsulfide dibromide as versatile reagents for beta-lactam synthesis
作者:Fernando P. Cossío、Iñaki Ganboa、Claudio Palomo
DOI:10.1016/s0040-4039(00)98613-1
日期:1985.1
Triphenylphosphinedibromide and dimethylsulfide dibromide are efficient reagents for the direct synthesis of beta-lactams from carboxylic acids and imines avoiding the use of acid halides as starting materials. Synthesis of 4-imino-beta-lactams are also briefly described. A potential synthesis of N-unsubstituted beta-lactams is made.
Synthesis of 3-acetoxyazetidin-2-ones and 3-hydroxyazetidin-2-ones with antifungal and antibacterial activity
作者:OM Walsh、MJ Meegan、RM Prendergast、T Al Nakib
DOI:10.1016/s0223-5234(97)86178-8
日期:1996.1
The synthesis of a series of 3-acetoxyazetidin-2-ones 3a-n and 3-hydroxyazetidin-2-ones 6a-j is reported together with the antibacterial and antifungal evaluation of these compounds. An additional series of 3-acetoxyazetidin-2-ones 11a-h which possess a free carboxylic acid group on the N-1 aryl ring were obtained by treatment of suitably substituted Schiff bases 10a-h with acetoxyacetyl chloride. The novel bicyclic structures 7 acetoxy-6-phenyl-5-thia-1-azabicyclo[4.2.0]octan-8-one 13 and 7-hydroxy-6-phenyl-5-thia-1-azabicyclo[4.2.0]octan-8-one 14 were also obtained. Many of the compounds displayed antifungal activity in vitro when evaluated against the pathogenic fungi Cryptococcus neoformans, Candida albicans, Candida tropicalis, Candida parapsilosis, Candida glabrata, and Trichosporon cutaneum, while 3-acetoxyazetidin-2-ones 11a-h containing a free carboxylic acid group on the N-1 aryl ring displayed antibacterial activity against Staphylococcus aureus, Proteus vulgaris, Pseudomonas aeruginosa, Bacillus subtilis, Klebsiella aerogenes and Escherischia coli.
A Convenient Synthesis of β-Lactams
作者:Muneharu Miyake、Makoto Kirisawa、Norio Tokutake
DOI:10.1055/s-1982-30061
日期:——
Yadav, Ram Naresh; Chavez, Ashlee; Banik, Bimal Krishna, Journal of the Indian Chemical Society, 2018, vol. 95, # 11, p. 1365 - 1367